support _POSIX_REALTIME_SIGNALS

Bug: 18489947
Change-Id: I2e834d68bc10ca5fc7ebde047b517a3074179475
diff --git a/libc/Android.mk b/libc/Android.mk
index ef1fb9b..90c2e92 100644
--- a/libc/Android.mk
+++ b/libc/Android.mk
@@ -201,8 +201,11 @@
     bionic/signalfd.cpp \
     bionic/sigpending.cpp \
     bionic/sigprocmask.cpp \
+    bionic/sigqueue.cpp \
     bionic/sigsuspend.cpp \
+    bionic/sigtimedwait.cpp \
     bionic/sigwait.cpp \
+    bionic/sigwaitinfo.cpp \
     bionic/socket.cpp \
     bionic/stat.cpp \
     bionic/statvfs.cpp \